public void create(String oql) throws QueryException {
_fieldNum = 0;
_expr = null;
_spCall = null;
// Separate parser for CALL-type queries (using stored procedured)
if (oql.startsWith("CALL ")) {
createCall(oql);
return;
}
Lexer lexer = new Lexer(oql);
Parser parser = new Parser(lexer);
ParseTreeNode parseTree = parser.getParseTree();
_dbEngine = _dbImpl.getPersistenceEngine();
if (_dbEngine == null) throw new QueryException("Could not get a persistence engine");
ParseTreeWalker walker = new ParseTreeWalker(_dbEngine, parseTree, _dbImpl.getClassLoader());
_objClass = walker.getObjClass();
_clsDesc = walker.getClassDescriptor();
_expr = walker.getQueryExpression();
_paramInfo = walker.getParamInfo();
_projectionType = walker.getProjectionType();
_pathInfo = walker.getPathInfo();
// port param info types back to the format of old bind types.
// first get the maximum SQL param.
int max = 0;
for (Enumeration e = _paramInfo.elements(); e.hasMoreElements(); ) {
ParamInfo info = (ParamInfo) e.nextElement();
for (Enumeration f = info.getParamMap().elements(); f.hasMoreElements(); ) {
int paramIndex = ((Integer) f.nextElement()).intValue();
if (paramIndex > max) max = paramIndex;
}
}
// then create the types array and fill it
_bindTypes = new Class[max];
for (Enumeration e = _paramInfo.elements(); e.hasMoreElements(); ) {
ParamInfo info = (ParamInfo) e.nextElement();
for (Enumeration f = info.getParamMap().elements(); f.hasMoreElements(); ) {
int paramIndex = ((Integer) f.nextElement()).intValue();
_bindTypes[paramIndex - 1] = f.getClass();
}
}
}
/** The simple parser for CALL-type queries (using stored procedured) */
public void createCall(String oql) throws QueryException {
StringBuffer sql;
int as;
int leftParen;
int rightParen;
int paramCnt;
String objType;
ParamInfo info;
StringBuffer sb;
Integer paramNo;
if (!oql.startsWith("CALL ")) {
throw new QueryException("Stored procedure call must start with CALL");
}
as = oql.indexOf(" AS ");
if (as < 0) {
throw new QueryException("Stored procedure call must end with \"AS <class-name>\"");
}
leftParen = oql.indexOf("(");
rightParen = oql.indexOf(")");
sql = new StringBuffer();
paramCnt = 0;
_paramInfo = new Hashtable();
if (leftParen < 0 && rightParen < 0) {
sql.append(oql.substring(5, as));
} else {
if ((leftParen < 0 && rightParen >= 0) || (leftParen > rightParen)) {
throw new QueryException("Syntax error: parenthesis");
}
sql.append(oql.substring(5, leftParen));
sql.append('(');
for (int i = leftParen + 1; i < rightParen; i++) {
if (oql.charAt(i) == '$') {
// get parameter number if given
sb = new StringBuffer();
for (int j = i + 1; j < rightParen; j++) {
char c;
c = oql.charAt(j);
if (c < '0' || c > '9') {
break;
}
sb.append(c);
}
if (sb.length() > 0) {
paramNo = Integer.valueOf(sb.toString());
} else {
paramNo = new Integer(paramCnt + 1);
}
info = (ParamInfo) _paramInfo.get(paramNo);
if (info == null) {
info = new ParamInfo("", "java.lang.Object");
}
info.mapToSQLParam(paramCnt + 1);
_paramInfo.put(paramNo, info);
paramCnt++;
}
}
for (int i = 0; i < paramCnt; i++) {
sql.append('?');
if (i < paramCnt - 1) sql.append(',');
}
sql.append(')');
}
_spCall = sql.toString();
_projectionType = ParseTreeWalker.PARENT_OBJECT;
_bindTypes = new Class[paramCnt];
for (int i = 0; i < paramCnt; i++) _bindTypes[i] = Object.class;
objType = oql.substring(as + 4).trim();
if (objType.length() == 0) {
throw new QueryException("Missing object name");
}
try {
if (_dbImpl.getClassLoader() == null) _objClass = Class.forName(objType);
else _objClass = _dbImpl.getClassLoader().loadClass(objType);
} catch (ClassNotFoundException except) {
throw new QueryException("Could not find class " + objType);
}
_dbEngine = _dbImpl.getPersistenceEngine();
if (_dbEngine == null || _dbEngine.getPersistence(_objClass) == null)
throw new QueryException("Could not find an engine supporting class " + objType);
}